Net Earnings Per Share (Schedule Of Information Necessary To Calculate Basic And Diluted Net Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Earnings Per Share [Abstract]
Weighted average shares - basic (in shares)	133,866,834	139,581,380
Common share equivalents (in shares)	989,000	1,899,000
Weighted average shares - diluted (in shares)	134,856,268	141,480,267
Net earnings for basic and diluted earnings per share computation	$ 38.5	$ 55.9
Net earnings per share - basic (in usd per share)	$ 0.29	$ 0.40
Net earnings per share - diluted (in usd per share)	$ 0.29	$ 0.40